Forget circumcision, the point was that Abraham was justified by faith in Genesis 15 but again justified by his works in Genesis 22, hence justification is ongoing. Forget your interpretation and read plainly: “Was not Abraham our father justified by works when he offered up his son Isaac on the altar? You see that faith was active along with his works, and faith was completed by his works.” James 2:21, 22 ESV
I never said he did; where do you get that from? Perhaps you should quote my words when responding using the bubble-quote feature in the upper-left corner of the comment box. Regardless of what you wrote, if Abraham solely believed without performing the work of offering Isaac, his faith would have been dead, hence he would have lost his initial justification: “Do you want to be shown, you foolish person, that faith apart from works is useless?” James 2:20 ESV
Yes, of course, there is a one-time justification, amen! But, there is not ONLY a one-time justification; that is the whole point of Saint James’ discourse on faith and works and his use of Abraham being justified not only by his faith in Genesis 15, but also his works in Genesis 22: “Was not Abraham our father justified by works” (James 2:21 ESV). Try not to put justification into this either/or dichotomy (i.e. it is either a one-time event or it is not), but rather a both/and perspective (i.e. it is both a one-time event and an on-going process).
Saint James was an Apostle and wrote: “Was not Abraham our father justified by works when he offered up his son Isaac on the altar? You see that faith was active along with his works, and faith was completed by his works” (James 2:21,22 ESV). Again, this event of Abraham offering Isaac occurred much later than when Abraham was initially justified before he was circumcised, so Abraham was initially justified by faith in a one-time event as you mention, but he was also justified by his works and those works made his faith complete. If you cannot see that as a process, then I cannot help you much more.
I do not follow.
What do you mean by scriptural witnesses?